JP2010003627A - Harness and battery device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a harness of a battery device capable of suppressing the number of electric wires for detecting voltage and the number of pins necessary for a battery ECU even if battery cells are increased. <P>SOLUTION: The harness electrically connects a battery cell group in which a plurality of battery cells 18 which are formed in pillar shape and whose end parts have positive and negative electrodes, respectively, are arranged in a plurality of columns so that the electrodes may face same direction, and a monitor part 17c which monitors charge and discharge state of the battery cell group. The harness of the battery device is provided with each voltage detection part (17a) to respectively detect the voltage value of each battery cell 18 of the battery cell group, each transmission part (17a) to transmit respectively the voltage value detected respectively by each voltage detection part (17a) to the monitor part 17c, a bus 8 to transmit the voltage value transmitted by each transmission part (17a) to the monitor part 17c, a power supply wire 7 to supply power of each transmission part (17a), and a fixed potential wire 9 which gives common fixed potential to each transmission part (17a) and the monitor part 17c. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention is a battery cell group formed in a columnar shape (columnar or prismatic shape), and a plurality of battery cells each provided with an electrode at each end, and arranged in a plurality of rows so that the electrodes face the same direction; The present invention relates to a harness that electrically connects a monitoring unit that monitors the charge / discharge state of the battery cell group, and a battery device equipped with the harness.

Recently, newly developed secondary batteries such as lithium ion batteries have been adopted as batteries installed in vehicles, in addition to lead batteries.
In the case of a lithium ion battery, since the electromotive voltage of a battery cell is small, it is often used by connecting a plurality of battery cells in series. Depending on the required capacity, a plurality of those connected in series may be connected in parallel. Moreover, since it is easy to deteriorate by overcharge and is weak to high temperature and the range of use temperature is limited, it is necessary to monitor a voltage and temperature for every battery cell.

FIG. 9 is a perspective view showing a part of the appearance of a battery module such as a conventional lithium ion battery.
The battery module 27 includes a plurality of battery cells 18 each having a columnar shape and electrodes provided on both bottoms, and two battery holding plates 19 a and 19 b that hold the electrodes of the battery cells 18. It is aligned and fixed in two rows in parallel.

  As shown in FIG. 2, the battery cell 18 has electrodes 18a (plus electrode or minus electrode) on both bottoms having a smaller diameter than the other columnar parts, and a bolt projects from the tip of the electrode 18a. . The holding plates 19a and 19b (the holding plates 19c and 19d in FIG. 2) are provided with through holes for inserting the electrodes 18a. In the battery cell 18, each of the bolts penetrates the bus bar 28 and the round terminal 30 as shown in FIG. 9A in a state where both the electrodes 18 a are fitted in the through holes of the holding plates 19 a and 19 b, respectively. The nuts 29 are screwed to be fixed to the holding plates 19a and 19b. The bus bar 28 connects two electrodes 18 a of adjacent battery cells 18.

  On the holding plate 19a side, each covered electric wire 36 terminated by each round terminal 30 is separated from the covered electric wire bundle 10a in the vicinity of each round terminal 30, and the covered electric wire bundle 10a is subjected to terminal treatment by the female connector 15a. Yes. Here, each of the covered electric wires 36 and the covered electric wire bundle 10a constitutes a harness for detecting the voltage of each battery cell 18. The female connector 15 a is connected to a male connector 15 b provided in a casing of a battery ECU (Electronic Control Unit) 17.

Also on the holding plate 19b side, similarly to the holding plate 19a side, each covered wire (not shown) terminated by each round terminal 30 is separated from the covered wire bundle 10b in the vicinity of each round terminal 30 and covered. The wire bundle 10b is terminated by the female connector 16a. Each covered electric wire and the covered electric wire bundle 10 b constitute a harness for detecting the voltage of each battery cell 18. The female connector 16a is connected to a male connector 16b provided in the casing of the battery ECU 17.
The output of the battery module 27 constituted by the battery cells 18 connected in series by each bus bar 28 is given to a junction box (not shown) by power lines 11a (for example, the minus side) and 11b (for example, the plus side).

FIG. 10 is a block diagram illustrating a circuit configuration example of the battery module 27 described above.
In the battery module 27, for example, ten battery cells 18 are connected in series between the power lines 11a and 11b. The voltage of each battery cell 18 is detected by the voltage detection unit 24, and each detected voltage value is given to the calculation control unit 25 and used for charge / discharge control of the battery module 27.

Each battery cell 18 includes a temperature sensor 20, and each temperature value detected by each temperature sensor 20 is converted into a digital signal by the temperature detection unit 23, and each converted temperature value is given to the arithmetic control unit 25. Thus, it is used for temperature control of the battery module 27 by a fan (not shown).
The current sensor 21 detects the output current of the battery module 27, the current value detected by the current sensor 21 is read into the current detection unit 22, and the read current value is given to the arithmetic control unit 25. Used for charge / discharge control of the battery module 27.

The current detection unit 22, the temperature detection unit 23, the voltage detection unit 24, and the calculation control unit 25 constitute a battery ECU 17 composed of a microcomputer.
The connection configurations on the holding plate 19a side and holding plate 19b side described above are schematically shown in FIG. 11, and the battery ECU 17 can individually detect the voltage value of each battery cell 18. .

In Patent Document 1, a case that stores a plurality of battery cells includes a holder that holds the plurality of battery cells, and a cover that is fixed to the holder so as to face the terminals of the battery cells. An assembled battery is disclosed in which a bus bar is disposed on the inner surface of the opposing case, and a weak electrical wiring material is disposed on the outer surface of the cover.
JP 2001-266825 A

  As described above, in the battery module, it is necessary to detect the voltage for each battery cell. For this reason, if the number of battery cells increases, the number of electric wires for detecting the voltage also increases, and there is a problem that the cost of the parts and the space required for the arrangement increase. Moreover, since the number of pins required for the battery ECU increases, there is a problem that an expensive ECU is required.

The present invention has been made in view of the circumstances as described above. In the first to third aspects of the invention, even if the battery cells increase, the amount of electric wires for detecting the voltage and the pins required for the battery ECU It aims at providing the harness of the battery apparatus which can suppress a number.
It is an object of the fourth to sixth inventions to provide a battery device capable of suppressing the amount of electric wires for detecting a voltage and the number of pins required for a battery ECU even if the number of battery cells increases.

  A harness according to a first aspect of the present invention is a battery cell group in which a plurality of battery cells each having positive and negative electrodes provided at end portions thereof are aligned in a plurality of rows so that the electrodes are directed in the same direction, and charging of the battery cell group. In a harness that electrically connects a monitoring unit that monitors a discharge state, each voltage detection unit that detects a voltage value of each battery cell of the battery cell group, and a voltage value detected by each voltage detection unit , Each transmitting unit for transmitting to the monitoring unit, a bus for transmitting the voltage value transmitted by each transmitting unit to the monitoring unit, a power supply line for supplying power to each transmitting unit, and each transmitting unit And a fixed potential line for applying a common fixed potential to the monitoring unit.

  In this harness, a plurality of battery cells each provided with an electrode at an end thereof are arranged in a plurality of rows so that the electrodes face the same direction, and a monitoring unit that monitors the charge / discharge state of the battery cell group And electrically connect. Each voltage detection unit detects the voltage value of each battery cell of the battery cell group, and each transmission unit transmits the voltage value detected by each voltage detection unit to the monitoring unit. The bus transmits the voltage value transmitted by each transmission unit to the monitoring unit, the power supply line supplies power to each transmission unit, and the fixed potential line provides a common fixed potential to each transmission unit and monitoring unit.

  In the harness according to the second aspect of the present invention, the bus, the power supply line, and the fixed potential line are bundled to form an electric wire bundle, and the electric wire bundle includes the voltage detection unit and the transmission for each one or two of the battery cells. And the transmitter, the bus, the power supply line, and the fixed potential line are each connected by a connector.

  In this harness, the bus, the power supply line, and the fixed potential line are bundled to form a wire bundle. The electric wire bundle has a storage unit that stores the voltage detection unit and the transmission unit for each battery cell of 1 or 2, and the transmission unit, the bus, the power supply line, and the fixed potential line are respectively connected to the connector. is there.

  The harness according to a third aspect of the present invention further includes each temperature detection unit that detects the temperature of each of the battery cells of 1 or 2, and each of the transmission units uses the bus to detect the temperature detected by each temperature detection unit. It is configured to transmit to the monitoring unit.

  In this harness, each temperature detection part detects the temperature for every 1 or 2 battery cells, respectively. Each transmission unit transmits the temperature detected by each temperature detection unit to the monitoring unit via a bus.

  According to a fourth aspect of the present invention, there is provided a battery device in which a plurality of battery cells each having positive and negative electrodes provided at end portions thereof are aligned in a plurality of rows so that the electrodes are directed in the same direction; In the battery device comprising: each voltage detection unit that detects a voltage value of each battery cell; and a monitoring unit that monitors a charge / discharge state of the battery cell group based on the voltage value detected by each voltage detection unit, Each voltage detection unit is arranged in the vicinity of each battery cell, and each transmission unit that transmits the voltage value detected by each voltage detection unit to the monitoring unit, and each transmission unit transmits A bus that transmits a voltage value to the monitoring unit, a power supply line that supplies power to each of the transmission units, and a fixed potential line that supplies a common fixed potential to each of the transmission units and the monitoring unit. .

  In this battery device, a plurality of battery cells each provided with an electrode at an end thereof are arranged in a plurality of rows so that the electrodes face the same direction, thereby forming a battery cell group. Each voltage detection part detects the voltage value of each battery cell of a battery cell group, respectively, and a monitoring part monitors the charging / discharging state of a battery cell group based on the voltage value which each voltage detection part detected. Each voltage detection part is arrange | positioned in the vicinity of each battery cell. Each transmission unit transmits the voltage value detected by each voltage detection unit to the monitoring unit, and the bus transmits the voltage value transmitted by each transmission unit to the monitoring unit. A power supply line supplies power to each transmission unit, and a fixed potential line applies a common fixed potential to each transmission unit and monitoring unit.

  In the battery device according to a fifth aspect of the invention, the bus, the power supply line, and the fixed potential line are bundled to form an electric wire bundle, and the electric wire bundle includes the voltage detection unit and the battery cell for each of the battery cells. The transmitter has a storage unit that stores the transmitter, and the transmitter, the bus, the power supply line, and the fixed potential line are each connected by a connector.

  In this battery device, the bus, the power supply line, and the fixed potential line are bundled to form an electric wire bundle. The electric wire bundle has a storage unit storing the voltage detection unit and the transmission unit for each battery cell of 1 or 2, and the transmission unit, the bus, the power supply line, and the fixed potential line are respectively connected to the connector. is there.

  The battery device according to a sixth aspect of the present invention further includes each temperature detection unit that detects the temperature of each of the battery cells of 1 or 2, and each of the transmission units uses the bus to detect the temperature detected by each temperature detection unit. It is configured to transmit to the monitoring unit.

  In this battery apparatus, each temperature detection part detects the temperature for every 1 or 2 battery cells, respectively. Each transmission unit transmits the temperature detected by each temperature detection unit to the monitoring unit via a bus.

  According to the harnesses according to the first to third aspects of the present invention, a battery device harness capable of suppressing the amount of electric wires for detecting a voltage and the number of pins required for the battery ECU even when the number of battery cells increases is realized. Can do. Accordingly, it is possible to suppress the cost of the electric wire parts and the space required for the arrangement, and the battery ECU can use an inexpensive ECU.

  According to the battery devices according to the fourth to sixth inventions, it is possible to realize a battery device capable of suppressing the amount of electric wires for detecting voltage and the number of pins required for the battery ECU even when the number of battery cells increases. it can. Accordingly, it is possible to suppress the cost of the electric wire parts and the space required for the arrangement, and the battery ECU can use an inexpensive ECU.

Hereinafter, the present invention will be described with reference to the drawings illustrating embodiments thereof.
FIG. 1 is a perspective view showing a part of the appearance of a battery module which is an embodiment of a harness and a battery device according to the present invention.
This battery module 27a is a columnar (cylindrical or prismatic), for example, 10 battery cells 18 of lithium-ion batteries each provided with electrodes on both bottoms, each holding two electrodes that hold each electrode of each battery cell 18. Between the plates 19c and 19d, they are aligned and fixed in two rows parallel to each other at an appropriate interval.

FIG. 2 is an explanatory diagram showing a method of fixing the battery cell 18 to the holding plates 19c and 19d.
In this fixing method, the battery cell 18 has electrodes 18a (plus electrode or minus electrode) on both bottoms having a smaller diameter than the other columnar parts, and a bolt projects from the tip of the electrode 18a. The holding plates 19c and 19d are provided with through holes for fitting the end portions of the battery cells 18 and the electrodes 18a. In the battery cell 18, each of the bolts penetrates the bus bar 28 and the round terminal 30 as shown in FIG. 9A in a state where both electrodes 18 a are respectively inserted into the through holes of the holding plates 19 c and 19 d, The nuts 29a are fixed to the holding plates 19c and 19d by screwing. The bus bar 28 connects two electrodes 18a (here, a plus electrode and a minus electrode) of the adjacent battery cells 18.

  The holding plates 19c and 19d are provided with notches 31 for every two battery cells 18. Each covered electric wire 33 connected to the bus bar 28 on the holding plate 19d side is inserted into each notch 31 on the holding plate 19d side. In each notch 31 on the holding plate 19c side, each end-processed covered electric wire 33 is fixed by each nut 29b.

FIG. 3 is an explanatory diagram showing a method of fixing each covered wire 33 with each nut 29b.
In this fixing method, each round terminal 30 a obtained by terminating each covered electric wire 33 is bent at a right angle with respect to the extending direction of the covered electric wire 33. Each through hole is provided adjacent to each notch 31 of the holding plate 19c, and each bolt 35 is inserted through the through hole from the inside of the holding plate 19c. Each bolt 35 inserted through each through hole is further inserted through each round terminal 30a obtained by terminating each covered electric wire 33 and each round terminal 30 obtained by terminating the covered electric wire 36a. In this state, the respective nuts 29b are screwed into the respective bolts 35, whereby the respective covered electric wires 33 and the respective covered electric wires 36a are fixed and connected at the respective notches 31 on the holding plate 19c side.

On the holding plate 19 c side, the respective covered electric wires 36 and 36 a subjected to the terminal treatment by the respective round terminals 30 are connected to the male connectors 32 a in the vicinity of the respective round terminals 30. The male connector 32a is connected to a later-described female connector 32b on the coated wire bundle 10c side.
The covered wire bundle 10c is terminated by the female connector 15c, and the laying direction of the covered wire bundle 10c matches the alignment direction of the battery cells 18.

Each covered electric wire 36, 36a, each male connector 32a, female connector 32b, the covered electric wire bundle 10c, and the female connector 15c constitute a harness for detecting the voltage of each battery cell 18. The female connector 15c is connected to a male connector 15d provided in a casing of a battery ECU (Electronic Control Unit) 17c.
Conventionally, the harness for detecting the voltage of each battery cell 18 provided on the holding plate 19d side becomes unnecessary by providing each covered electric wire 33.
The output of the battery module constituted by the battery cells 18 connected in series by each bus bar 28 is given to a junction box (not shown) by power lines 11a (for example, the minus side) and 11b (for example, the plus side).

FIG. 4 is a block diagram showing a circuit configuration of the battery module 27a described above.
In the battery module 27a, for example, ten battery cells 18 are connected in series between the power lines 11a and 11b. Both electrodes of each battery cell 18 are connected to each voltage detector 24a, and each voltage detector 24a detects the voltage value of each battery cell 18, respectively. Each detected voltage value is given to each arithmetic control unit 25a, converted into a digital signal, and given to each communication unit 6. Each communication unit 6 transmits the given digitized voltage value to the battery ECU 17c via the bus 8 by, for example, LIN (Local Interconnect Network) communication.

The voltage detection unit 24a, the calculation control unit 25a, and the communication unit 6 described above are housed in the male connector 32a and constitute a voltage detection ECU 17a.
Only the power supply line 7, the bus 8, and the ground line (fixed potential line) 9 for supplying power to each communication unit 6 are bundled in the above-described covered wire bundle 10c. The power supply line 7, the bus 8, and the ground line 9 are connected to each communication unit 6 by each female connector 32 b provided corresponding to each male connector 32 a.

Therefore, each of the female connector 15c of the covered wire bundle 10c and the male connector 15d of the battery ECU 17c only needs to have three terminals, and the battery ECU 17c can be reduced in size and numbered.
The battery module 27a is similar to the above-described conventional battery module 27 (FIG. 10), and the battery ECU 17c reads the current value detected by a current sensor (not shown), and the read current value is the battery module 27a. Used for charge / discharge control.

  Each connection configuration on the holding plate 19c side described above is schematically shown in FIG. 5, and each voltage detection ECU 17a individually detects the voltage value of each battery cell 18 and passes through the bus 8. It transmits to battery ECU17c. At that time, for example, the battery ECU 17c sequentially sends a transmission request (polling) to each voltage detection ECU 17a, and the voltage detection ECU 17a requested to transmit the response returns it.

In addition, when the battery cell 18 is a lithium ion battery, the temperature of the battery cell 18 is required for the charge / discharge control. In this case, for example, as shown in the block diagram of FIG. 6, the battery module 27 b includes a temperature sensor 20 attached to the bus bar 28 and a temperature detection unit 23 a in the voltage detection ECU 17 b for every two battery cells 18. The two covered wires 20a and 20b are connected.
The voltage detection ECU 17b is built in the male connector 32c, and the temperature detected by the temperature detection unit 23a is digitized by the calculation control unit 25a. The communication unit 6 transmits the digitized temperature to the battery ECU 17c via the bus 8.

  FIG. 7 schematically shows each connection configuration when the temperature sensor 20 described above is included. In this case, one temperature sensor 20 is attached to the bus bar 28 for every two battery cells 18, but one temperature sensor 20 may be provided for every battery cell 18. good. In that case, the temperature sensor 20 is directly attached to the battery cell 18, and each voltage detection ECU becomes the voltage detection ECU 17b and includes the temperature detection unit 23a.

  In the above-described embodiment, one voltage detection ECU 17a is provided for each battery cell 18, but for example, one voltage detection ECU may be provided for each two battery cells 18. good. In this case, the voltage detection ECU detects each voltage value of the two battery cells 18 and transmits it to the battery ECU 17 c via the bus 8.

In the above-described embodiment, the voltage detection ECU 17a and the covered wire bundle 10c are connected by connectors, but other connection methods are also possible.
For example, as shown in FIG. 8, about half of a rectangular parallelepiped case 37a that houses the voltage detection ECU 17a is a portion with a lid 37b that includes a side wall and a ceiling. The power supply line 7, the bus 8, and the ground line 9 are inserted through the portion with the lid 37b. Further, the covered electric wires 36, 36a for voltage detection are inserted through the portion with the lid 37b and connected to the voltage detection ECU 17a. In the portion with the lid 37b, the power supply line 7, the bus 8 and the grounding line 9 are pressed against the respective pressure contact terminals 34, 34, 34 projecting from the voltage detection ECU 17a, and the lid 37b is attached.

It should be noted that the technical scope of the present invention is not limited by the above-described embodiments, and for example, those described below are also included in the technical scope of the present invention.
The battery cell is not limited to a cylindrical shape, and may be, for example, a prismatic shape or a rectangular shape. Further, the battery cell array may be three or more rows or one row, and the electrode surface may be a lateral side or an upper surface.
In the embodiment, there is no particular limitation on the shape, the number, and the formation position as long as it can be connected to the battery cell.

It is a perspective view which shows a part of external appearance of the battery module which is embodiment of the harness which concerns on this invention, and a battery apparatus. It is explanatory drawing which shows the fixing method to the holding plate of a battery cell. It is explanatory drawing which shows the fixing method with the nut of a covered wire | conductor. It is a block diagram which shows the circuit structure of a battery module. It is a schematic diagram which shows each connection structure by the side of a holding board collectively. It is a block diagram which shows the circuit structure of the battery module containing a temperature sensor. It is a schematic diagram which shows collectively each connection structure in case a temperature sensor is included. It is explanatory drawing which shows the other connection method of voltage detection ECU and a covered wire bundle. It is a perspective view which shows a part of external appearance of battery modules, such as the conventional lithium ion battery. It is a block diagram which shows the circuit structural example of the battery module shown in FIG. It is a schematic diagram which shows each connection structure by the side of the conventional holding plate collectively.

Explanation of symbols

6 Communication section 7 Power supply line 8 Bus 9 Ground line (fixed potential line)
10c Covered wire bundle 11a, 11b Power line 17a, 17b Voltage detection ECU
17c Battery ECU
18 battery cell 18a electrode 19c, 19d holding plate 20 temperature sensor 23a temperature detection unit 24a voltage detection unit 25a calculation control unit 27a, 27b battery module 28 bus bar 29a, 29b nut 30, 30a round terminal 31 notch 32a, 32c male connector 32b female Connector 33, 36, 36a Covered wire 34 Press contact terminal 37a Case 37b Lid

Claims (6)

A battery cell group in which a plurality of battery cells each having positive and negative electrodes provided at end portions thereof are aligned in a plurality of rows so that the electrodes face the same direction, and a monitoring unit that monitors the charge / discharge state of the battery cell group, In a harness that electrically connects
Each voltage detection unit that detects the voltage value of each battery cell in the battery cell group, each transmission unit that transmits the voltage value detected by each voltage detection unit to the monitoring unit, and each transmission unit A bus for transmitting the voltage value transmitted to the monitoring unit, a power supply line for supplying power to the transmitting units, and a fixed potential line for supplying a common fixed potential to the transmitting units and the monitoring unit. A characteristic harness.   The bus, the power supply line, and the fixed potential line are bundled to form an electric wire bundle, and the electric wire bundle has a storage unit that stores the voltage detection unit and the transmission unit for each one or two of the battery cells. The harness according to claim 1, wherein the transmission unit, the bus, the power supply line, and the fixed potential line are connected by connectors.   Each of the temperature detectors further detects the temperature of each of the battery cells of 1 or 2, and each of the transmitters is configured to transmit the temperature detected by each of the temperature detectors to the monitoring unit via the bus. The harness according to claim 1 or 2. A plurality of battery cells each having positive and negative electrodes provided at the ends thereof are arranged in a plurality of rows so that the electrodes are directed in the same direction, and a voltage value of each battery cell of the battery cell group is detected. In each of the battery devices, and a monitoring unit that monitors a charge / discharge state of the battery cell group based on the voltage value detected by each voltage detection unit,
Each voltage detection unit is arranged in the vicinity of each battery cell, each transmission unit that transmits the voltage value detected by each voltage detection unit to the monitoring unit, and each transmission unit transmits A bus for transmitting the measured voltage value to the monitoring unit, a power supply line for supplying power to each of the transmission units, and a fixed potential line for supplying a common fixed potential to each of the transmission units and the monitoring unit. Battery device.   The bus, the power supply line, and the fixed potential line are bundled to form an electric wire bundle, and the electric wire bundle has a storage unit that stores the voltage detection unit and the transmission unit for each one or two of the battery cells. The battery device according to claim 4, wherein the transmission unit, the bus, the power supply line, and the fixed potential line are each connected by a connector.   Each of the temperature detectors further detects the temperature of each of the battery cells of 1 or 2, and each of the transmitters is configured to transmit the temperature detected by each of the temperature detectors to the monitoring unit via the bus. The battery device according to claim 4 or 5.

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